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If f(x)=(1)/(x), then find the value of...

If `f(x)=(1)/(x)`, then find the value of `theta` in the mean value theorem
`f(x+h)=f(x)+hf'(x+theta h), 0 lt theta lt 1`.

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The correct Answer is:
`theta=(1)/(h)(sqrt(x^(2)+xh)-x)`
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